Connecting pipe assembling method

Abstract

The invention relates to the technical field of equipment assembly, and provides a connecting pipe assembly method which comprises the following steps: acquiring a first connecting pipe and a second connecting pipe, arranging one end part of the first connecting pipe at a connecting position of an external system through a flange, and arranging one end part of the second connecting pipe at a connecting position of a reactor body through a flange, the other end of the first connecting pipe is provided with a first flange plate; the other end of the second connecting pipe is provided with a second flange plate matched with the first flange plate; the gradient of the sealing face of the first connecting pipe is obtained, and the sealing face is the end face, facing the second connecting pipe and making contact with the sealing ring, of the first flange plate; one end face of the sealing ring is machined according to the gradient; and the machined end face of the sealing ring faces the first flange plate and is installed between the first flange plate and the second flange plate. Flange connection replaces welding, the thermal deformation risk is avoided, meanwhile, the assembly process is simplified, the production period is greatly shortened, and the reactor connecting pipe connecting efficiency is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe assembly, and in particular to a pipe assembly method. Background Art

[0002] In a reactor system, nozzles are key components connecting the reactor core, such as the reactor pressure vessel, with external systems, such as the cooling system. The accuracy of these connections directly impacts the system's sealing performance, structural integrity, and operational safety. High-precision nozzle connections effectively prevent media leakage, reduce radiation risks, and ensure long-term stable operation of the reactor under high-temperature and high-pressure conditions.

[0003] In related technologies, the guidance and sealing of reactor nozzles primarily rely on welding processes. However, thermal deformation and process fluctuations during welding can easily cause actual parameters to deviate from design values. Since nozzle design tolerances are typically small (e.g., ±0.1mm), even slight deviations can cause seal failure or assembly difficulties. Furthermore, nozzle connections rely entirely on welding, lacking real-time correction capabilities. Once data deviates from tolerances, subsequent adjustments are often difficult to restore, and the product may even need to be scrapped, resulting in significant quality risks and cost losses. Furthermore, the welding process is inefficient, requiring manual operation and repeated testing, which not only prolongs production cycles but also increases manufacturing costs. Summary of the Invention

[0004] The problem solved by the present invention is how to improve the reactor pipe connection efficiency.

[0005] To solve the above problems, the present invention provides a method for assembling a pipe, comprising: Obtain a first connecting pipe and a second connecting pipe, and dispose one end of the first connecting pipe at a connection position of an external system via a flange, dispose one end of the second connecting pipe at a connection position of a reactor body via a flange, install a first flange on the other end of the first connecting pipe, and install a second flange matching the first flange on the other end of the second connecting pipe, wherein the first flange and the second flange are disposed correspondingly, and a sealing ring is disposed between the first flange and the second flange; Obtaining the inclination of the sealing surface of the first connecting pipe, wherein the sealing surface is the end surface of the first flange facing the second connecting pipe and in contact with the sealing ring; Processing one end surface of the sealing ring according to the inclination; The processed end surface of the sealing ring is installed between the first flange and the second flange, with the end surface facing the first flange.

[0006] Optionally, obtaining the inclination of the sealing surface of the first connecting pipe includes: Using a laser tracker to obtain the center points of both end faces of the first connecting pipe and multiple positioning points on the sealing surface; Using three-dimensional simulation software, fitting the axis of the first connecting pipe according to the two center points, and generating a plane to be measured according to the plurality of positioning points; Taking the center of the plane to be measured as a reference, constructing a reference plane perpendicular to the axis; The angle between the reference plane and the plane to be measured is obtained to obtain the inclination of the sealing surface.

[0007] Optionally, processing one end surface of the sealing ring according to the inclination includes: Based on the center of the plane to be measured, construct a vertical plane perpendicular to the horizontal line, obtain the angle between the vertical plane and the plane to be measured, and obtain a compensation angle; One end surface of the sealing ring is processed according to the compensation angle.

[0008] Optionally, processing one end surface of the sealing ring according to the compensation angle includes: Based on the law of cosines, the machining thickness of the sealing ring is obtained according to the compensation angle, the plane length, and the diameter of the sealing ring, wherein the plane length is the distance between multiple reference points pre-set on the plane to be measured; Multi-point coplanar processing is performed on one end surface of the sealing ring according to the processing thickness.

[0009] Optionally, obtaining the processing thickness of the sealing ring based on the cosine theorem according to the compensation angle, the plane length, and the diameter of the sealing ring includes: Taking the point on the plane to be measured that is farthest from the second connecting pipe as the first reference point, the edge of the plane to be measured is divided into four equal points to obtain a second reference point, a third reference point, and a fourth reference point; Based on the cosine theorem and taking the first reference point as a basis, the corresponding machining thicknesses at the second reference point, the third reference point, and the fourth reference point are respectively obtained according to the diameter of the sealing ring and the compensation angle.

[0010] Optionally, after processing one end surface of the sealing ring according to the inclination, the method further comprises: After the sealing ring is mounted on the first flange, a first parallelism of the end face of the sealing ring facing the second flange and a second parallelism of the sealing surface of the second flange are obtained using 3D scanning software; The first parallelism and the second parallelism are compared, and the pipe assembly requirement is determined according to the comparison result.

[0011] Optionally, comparing the first parallelism and the second parallelism and determining the pipe assembly requirement according to the comparison result includes: If the deviation between the first parallelism and the second parallelism is greater than the preset error value, the pipe assembly does not meet the assembly requirements, and the process returns to the step of obtaining the inclination of the sealing surface of the first pipe until the deviation is less than the preset error value. If the deviation is less than or equal to the preset error value, the pipe assembly meets the assembly requirements.

[0012] Optionally, before obtaining the inclination of the sealing surface of the first connecting pipe, the method further includes: The sealing surface is pretreated.

[0013] Optionally, the pre-processing of the sealing surface includes: The sealing surface is cleaned.

[0014] Optionally, the pre-processing of the sealing surface includes: Performing laser scanning on the sealing surface, and judging whether the sealing surface has bumps and scratches according to the scanning result; If so, replace the first flange.

[0015] The beneficial effects of the pipe assembly method of the present invention are as follows: two pipes are obtained, namely a first pipe and a second pipe, and a connection structure in which a flange and a sealing ring are matched is adopted, thereby avoiding the dimensional deviation problem caused by welding thermal deformation in the traditional welding process and the risk of sealing surface warping caused by thermal stress, ensuring that the initial accuracy of the pipe connection is easier to control. At the same time, the flange connection method is convenient for quick disassembly and adjustment, without relying on complex welding procedures, greatly shortening the assembly time and improving the connection efficiency. The sealing ring is arranged between the first flange and the second flange, providing a physical basis for the subsequent compensation of the sealing performance, reducing quality risks and cost losses. By obtaining the inclination of the sealing surface of the first flange, the actual morphological deviation of the sealing surface (such as flatness and parallelism errors) can be accurately captured, realizing real-time perception of the state of the sealing surface, providing targeted data basis for the subsequent processing of the sealing ring, avoiding the mismatch problem between the sealing ring and the sealing surface caused by blind processing, and further ensuring the reliability of the sealing performance. One end face of the sealing ring is machined according to the inclination of the sealing surface, so that the end face shape of the sealing ring forms a complementary match with the inclination of the sealing surface of the first flange. This can actively compensate for the inherent deviation of the sealing surface. Even if the sealing surface has a slight inclination, a tight fit can be achieved through the adaptive processing of the sealing ring, reducing excessive reliance on the machining accuracy of the connecting pipe parts and reducing the risk of scrap due to part deviations. The machined sealing ring is installed with the adaptive end face facing the first flange, ensuring that the sealing ring and the sealing surface of the first flange achieve maximum fit, eliminating local gaps caused by the inclination of the sealing surface, improving sealing performance, and preventing reactor medium leakage. The installation process is simple and efficient, effectively shortening the assembly cycle. The present invention replaces welding with flange connection, avoids the risk of thermal deformation, reduces dependence on high-precision parts processing, reduces quality costs and scrap rates, and realizes active compensation of sealing performance through real-time detection and targeted processing of the sealing surface, ensuring that the fitting accuracy of the sealing surface and the sealing ring meets the design requirements, thereby ensuring the operating safety of the reactor under high temperature and high pressure conditions. At the same time, the simplified assembly process greatly shortens the production cycle and effectively improves the efficiency of the reactor pipe connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the process of the pipe assembly method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the pipe assembly structure according to an embodiment of the present invention; Figure 3 This is a schematic side view of the pipe assembly structure according to an embodiment of the present invention; Figure 4 Schematic diagram of the inclination of the sealing surface according to an embodiment of the present invention; Figure 5 A schematic diagram of processing thickness according to an embodiment of the present invention; Figure 6Schematic diagram of the processing of the sealing ring according to an embodiment of the present invention. DETAILED DESCRIPTION

[0017] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0018] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to"; the term "based on" means "based at least in part on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0019] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0020] like Figure 1 As shown, an embodiment of the present invention provides a method for assembling a pipe, comprising: Step S1: Obtain a first connecting pipe and a second connecting pipe, and set one end of the first connecting pipe at a connection position of an external system through a flange, and set one end of the second connecting pipe at a connection position of a reactor body through a flange, and install a first flange plate on the other end of the first connecting pipe, and install a second flange plate matching the first flange plate on the other end of the second connecting pipe, wherein the first flange plate and the second flange plate are correspondingly arranged, and a sealing ring is provided between the first flange plate and the second flange plate.

[0021] Specifically, one end of the first connecting pipe is connected to the external system (such as the coolant pipe, safety system pipe, etc.) through a flange, and the other end is installed with a first flange for subsequent docking with the second connecting pipe. One end of the second connecting pipe is connected to the reactor body (such as the pressure vessel) through a flange, and the other end is installed with a second flange, which is set corresponding to the first flange. During installation, a sealing ring is installed between the first flange and the second flange to realize the connecting pipe assembly, ensure the sealing of the connection, and prevent medium leakage (such as coolant leakage). Figure 2 and Figure 3 As shown, Figure 2 (a) represents the end face of the first flange facing the second connecting pipe, a represents the first connecting pipe, and c represents the first flange. Figure 2 (b) in the middle indicates the end face of the second flange facing the first connecting pipe, b indicates the second connecting pipe, and d indicates the second flange. Figure 2 (b) in the middle shows the side view of the first flange after the sealing ring is installed, and (e) shows the sealing ring.

[0022] Step S2: Obtain the inclination of the sealing surface of the first connecting pipe, wherein the sealing surface is the end surface of the first flange facing the second connecting pipe and in contact with the sealing ring.

[0023] Specifically, the sealing surface Figure 2 The p shown in (a) can be used to obtain the inclination of the sealing surface relative to the horizontal angle or the inclination of the sealing surface relative to the vertical angle.

[0024] Step S3: processing one end surface of the sealing ring according to the inclination.

[0025] Step S4: Install the processed end surface of the sealing ring between the first flange and the second flange with the end surface facing the first flange.

[0026] It should be noted that in a reactor system, the reactor body (such as core equipment such as the pressure vessel and core vessel) needs to be connected to external systems (such as the primary cooling system, safety system, or measurement system) or pipelines through pipes to achieve functions such as coolant circulation, material exchange, and signal transmission. The second pipe is installed on the reactor body, and its precision matches the accuracy of the machine tool. Therefore, in most application scenarios, the axis of the second pipe is horizontal, or the error is negligible. However, when the first pipe is connected to an external system with unguaranteed accuracy, due to the uncertain shape and accuracy of the external system, the first pipe will have certain deviations after installation. Therefore, only the first pipe needs to be adjusted.

[0027] In this embodiment, two pipes, namely a first pipe and a second pipe, are obtained, and a connection structure that cooperates with a flange and a sealing ring is adopted. This avoids the dimensional deviation caused by thermal deformation during welding in traditional welding processes and the risk of sealing surface warping caused by thermal stress, ensuring that the initial accuracy of the pipe connection is easier to control. Furthermore, the flange connection method facilitates quick disassembly, assembly, and adjustment without relying on complex welding processes, significantly shortening assembly time and improving connection efficiency. The sealing ring is provided between the first and second flanges, providing a physical basis for subsequent compensation of sealing performance, reducing quality risks and cost losses. By obtaining the inclination of the sealing surface of the first flange, the actual morphological deviation of the sealing surface (such as flatness and parallelism errors) can be accurately captured, achieving real-time perception of the sealing surface state, providing targeted data for subsequent sealing ring processing, avoiding the mismatch between the sealing ring and the sealing surface caused by blind processing, and further ensuring the reliability of the sealing performance. One end face of the sealing ring is machined according to the inclination of the sealing surface, so that the end face shape of the sealing ring forms a complementary match with the inclination of the sealing surface of the first flange. This can actively compensate for the inherent deviation of the sealing surface. Even if the sealing surface has a slight inclination, a tight fit can be achieved through the adaptive processing of the sealing ring, reducing excessive reliance on the machining accuracy of the connecting pipe parts and reducing the risk of scrap due to part deviations. The machined sealing ring is installed with the adaptive end face facing the first flange, ensuring that the sealing ring and the sealing surface of the first flange achieve maximum fit, eliminating local gaps caused by the inclination of the sealing surface, improving sealing performance, and preventing reactor medium leakage. The installation process is simple and efficient, effectively shortening the assembly cycle. The present invention replaces welding with flange connection, avoids the risk of thermal deformation, reduces dependence on high-precision parts processing, reduces quality costs and scrap rates, and realizes active compensation of sealing performance through real-time detection and targeted processing of the sealing surface, ensuring that the fitting accuracy of the sealing surface and the sealing ring meets the design requirements, thereby ensuring the operating safety of the reactor under high temperature and high pressure conditions. At the same time, the simplified assembly process greatly shortens the production cycle and effectively improves the efficiency of the reactor pipe connection.

[0028] Optionally, obtaining the inclination of the sealing surface of the first connecting pipe includes: A laser tracker is used to obtain the center points of both end faces of the first connecting pipe and multiple positioning points on the sealing surface.

[0029] Specifically, multiple target balls installed on the end face of the first pipe and the sealing surface can be used to perform laser tracking on the first pipe and the sealing surface. For example, 3 evenly distributed measuring points (forming a triangle) are taken on each of the two end faces of the first pipe to determine the center point, and 8-12 measuring points are set on the sealing surface, with evenly distributed edges and denser center areas to obtain the shape of the sealing surface.

[0030] Using three-dimensional simulation software, the axis of the first connecting pipe is obtained by fitting according to the two center points, and the plane to be measured is generated according to the multiple positioning points.

[0031] A reference plane perpendicular to the axis is constructed with the center of the plane to be measured as a reference.

[0032] The angle between the reference plane and the plane to be measured is obtained to obtain the inclination of the sealing surface.

[0033] Specifically, the above data are imported into 3D simulation software (such as PolyWorks), and the least squares method is used to fit the line connecting the center points of the two end faces to obtain the axis of the first pipe. The 3D simulation software generates the plane to be measured based on multiple positioning points. Theoretically, the shape of the first pipe is a regular cylinder, that is, the plane to be measured and the axis should be perpendicular to each other. However, in order to improve the sealing performance of the flange connection between the two pipes, the shape of the first pipe needs to be further verified. Therefore, with the center of the plane to be measured as the reference, a reference plane perpendicular to the axis is constructed, that is, the center of the reference plane coincides with the center of the plane to be measured, such as Figure 4 As shown in the figure, l represents the axis, f represents the plane to be measured, g represents the reference plane, and m represents the inclination. If the first connecting pipe is deformed, the plane to be measured will deviate from the reference plane. Therefore, the angle between the reference plane and the plane to be measured is the inclination of the sealing surface. The positive and negative signs can also indicate the direction of the inclination. If the plane to be measured tilts 3° toward the other end of the first connecting pipe, the inclination of the sealing surface is +3°, and vice versa, the inclination is -3°.

[0034] Optionally, processing one end surface of the sealing ring according to the inclination includes: Based on the center of the plane to be measured, a vertical plane perpendicular to the horizontal line is constructed, and the angle between the vertical plane and the plane to be measured is obtained to obtain a compensation angle.

[0035] One end surface of the sealing ring is processed according to the compensation angle.

[0036] Specifically, although the sealing surface and the second flange are positioned correspondingly, they are not parallel. If a sealing ring is placed therein for sealing, the sealing surface of the first flange and the sealing ring may not fit tightly together, or the sealing ring may be too large, causing problems in the connection between the first and second flanges. Therefore, the sealing ring needs to be processed in accordance with the inclination of the sealing surface so that the shape and size of the sealing ring match those of the first and second flanges, thereby increasing the sealing effect of the two flanges. Figure 5As shown, a vertical plane is constructed based on the center of the plane to be measured. It should be noted that due to the high precision of the second connecting pipe, the sealing surface of the second flange is theoretically parallel to the vertical plane. The angle between the vertical plane and the plane to be measured is obtained to obtain the compensation angle o. Then, based on the compensation angle, the thickness of the sealing ring to be machined is calculated, and then the sealing ring is machined. The side view shape of the sealing ring after the process is usually as follows Figure 6 The right trapezoid shown in .

[0037] Optionally, processing one end surface of the sealing ring according to the compensation angle includes: Based on the law of cosines, the machining thickness of the sealing ring is obtained according to the compensation angle, the plane length, and the diameter of the sealing ring, wherein the plane length is the distance between multiple reference points pre-set on the plane to be measured; Multi-point coplanar processing is performed on one end surface of the sealing ring according to the processing thickness.

[0038] Specifically, after obtaining the compensation angle and the diameter of the sealing ring, it is still necessary to obtain the plane length, and then calculate the machining thickness of each reference point at the corresponding position of the sealing ring based on the cosine theorem, and perform multi-point coplanar machining based on the machining thickness so that the shape of the sealing ring is adapted to the sealing surface. Figure 5 As shown, the upper vertex i and the lower vertex h of the sealing surface are taken as reference points. The distance between the upper vertex i and the lower vertex h is used to obtain the plane length j. d represents the diameter of the sealing ring. Based on the cosine theorem, the processing thickness k= ,like Figure 6 As shown, the dotted line portion is the portion of the sealing ring that needs to be processed and removed.

[0039] Optionally, obtaining the processing thickness of the sealing ring based on the cosine theorem according to the compensation angle, the plane length, and the diameter of the sealing ring includes: Taking the point on the plane to be measured that is farthest from the second connecting pipe as the first reference point, the edge of the plane to be measured is divided into four equal points to obtain a second reference point, a third reference point, and a fourth reference point; Based on the cosine theorem and taking the first reference point as a basis, the corresponding machining thicknesses at the second reference point, the third reference point, and the fourth reference point are respectively obtained according to the diameter of the sealing ring and the compensation angle.

[0040] Specifically, a plurality of reference points may be provided to increase the accuracy of the coplanar machining of the sealing ring.

[0041] Optionally, after processing one end surface of the sealing ring according to the inclination, the method further comprises: After the sealing ring is mounted on the first flange, a first parallelism of the end face of the sealing ring facing the second flange and a second parallelism of the sealing surface of the second flange are obtained using three-dimensional scanning software.

[0042] The first parallelism and the second parallelism are compared, and the pipe assembly requirement is determined according to the comparison result.

[0043] Specifically, after the sealing ring is installed on the first flange, the sealing surface of the first flange is corrected. The parallelism between the corrected first and second flanges needs to be verified to ensure the correction is effective. Using 3D scanning software, the end face of the first flange, where the sealing ring is installed, is fitted to obtain a first degree of parallelism. The end face of the second flange is scanned and fitted to obtain a second degree of parallelism. The first and second degrees of parallelism are compared to determine whether they meet the pipe assembly requirements.

[0044] Optionally, comparing the first parallelism and the second parallelism and determining the pipe assembly requirement according to the comparison result includes: If the deviation between the first parallelism and the second parallelism is greater than the preset error value, the pipe assembly does not meet the assembly requirements, and the operation of obtaining the inclination of the sealing surface of the first pipe is returned to execution until the deviation is less than the preset error value, wherein the preset error value can be adjusted and set according to actual conditions.

[0045] If the deviation is less than or equal to the preset error value, it means that the corrected first flange is compatible with the second flange and the pipe assembly meets the assembly requirements. Otherwise, it does not meet the pipe assembly requirements and needs to be corrected again.

[0046] Optionally, before obtaining the inclination of the sealing surface of the first connecting pipe, the method further includes: The sealing surface is pretreated.

[0047] Specifically, the sealing surface is pre-treated to ensure the accuracy of subsequent inclination measurement and sealing effect. Pre-treatment operations may include stress relief, spraying anti-corrosion coating, deburring, etc.

[0048] Optionally, the pre-processing of the sealing surface includes: The sealing surface is cleaned.

[0049] Specifically, the sealing surface is cleaned to ensure tight fit between the sealing surface and the sealing ring. The cleaning process may include removing oil stains and impurities.

[0050] Optionally, the pre-processing of the sealing surface includes: Performing laser scanning on the sealing surface, and judging whether the sealing surface has bumps and scratches according to the scanning result; If so, replace the first flange.

[0051] Specifically, if the sealing surface has bumps or scratches, it will affect the subsequent inclination measurement accuracy and sealing effect. Therefore, the sealing surface can be laser scanned and displayed in 3D simulation software (such as AutoCAD, SolidWorks, etc.). If there are bumps, the first flange needs to be replaced. After obtaining the sealing surface in the 3D simulation software, multiple points are divided on the sealing surface and the parallelism of each point is tested. If the parallelism of any point exceeds the preset value, the sealing surface is judged to have bumps or scratches. Otherwise, the sealing surface is judged to be intact and subsequent operations can proceed normally.

[0052] Although the present invention is disclosed as above, the protection scope of the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A method for assembling a pipe, characterized in that: include: Obtain a first connecting pipe and a second connecting pipe, and dispose one end of the first connecting pipe at a connection position of an external system via a flange, dispose one end of the second connecting pipe at a connection position of a reactor body via a flange, install a first flange on the other end of the first connecting pipe, and install a second flange matching the first flange on the other end of the second connecting pipe, wherein the first flange and the second flange are disposed correspondingly, and a sealing ring is disposed between the first flange and the second flange; Obtaining the inclination of the sealing surface of the first connecting pipe, wherein the sealing surface is the end surface of the first flange facing the second connecting pipe and in contact with the sealing ring; Processing one end surface of the sealing ring according to the inclination; The processed end surface of the sealing ring is installed between the first flange and the second flange, with the end surface facing the first flange.

2. The pipe assembly method according to claim 1, characterized in that: The obtaining of the inclination of the sealing surface of the first connecting pipe includes: Using a laser tracker to obtain the center points of both end faces of the first connecting pipe and multiple positioning points on the sealing surface; Using three-dimensional simulation software, fitting the axis of the first connecting pipe according to the two center points, and generating a plane to be measured according to the plurality of positioning points; Taking the center of the plane to be measured as a reference, constructing a reference plane perpendicular to the axis; The angle between the reference plane and the plane to be measured is obtained to obtain the inclination of the sealing surface.

3. The pipe assembly method according to claim 2, characterized in that: The processing of the end surface of the sealing ring according to the inclination includes: Based on the center of the plane to be measured, construct a vertical plane perpendicular to the horizontal line, obtain the angle between the vertical plane and the plane to be measured, and obtain a compensation angle; One end surface of the sealing ring is processed according to the compensation angle.

4. The method for assembling a pipe according to claim 3, characterized in that: The processing of the end surface of the sealing ring according to the compensation angle includes: Based on the law of cosines, the machining thickness of the sealing ring is obtained according to the compensation angle, the plane length, and the diameter of the sealing ring, wherein the plane length is the distance between multiple reference points pre-set on the plane to be measured; Multi-point coplanar processing is performed on one end surface of the sealing ring according to the processing thickness.

5. The pipe assembly method according to claim 4, characterized in that: The method of obtaining the machining thickness of the sealing ring based on the cosine theorem according to the compensation angle, the plane length, and the diameter of the sealing ring includes: Taking the point on the plane to be measured that is farthest from the second connecting pipe as the first reference point, the edge of the plane to be measured is divided into four equal points to obtain a second reference point, a third reference point, and a fourth reference point; Based on the cosine theorem and taking the first reference point as a basis, the corresponding machining thicknesses at the second reference point, the third reference point, and the fourth reference point are respectively obtained according to the diameter of the sealing ring and the compensation angle.

6. The method for assembling a pipe according to claim 1, characterized in that: After processing one end surface of the sealing ring according to the inclination, the method further includes: After the sealing ring is mounted on the first flange, a first parallelism of the end face of the sealing ring facing the second flange and a second parallelism of the sealing surface of the second flange are obtained using 3D scanning software; The first parallelism and the second parallelism are compared, and the pipe assembly requirement is determined according to the comparison result.

7. The method for assembling a pipe according to claim 6, characterized in that: The comparing the first parallelism and the second parallelism and determining the pipe assembly requirement according to the comparison result includes: If the deviation between the first parallelism and the second parallelism is greater than the preset error value, the pipe assembly does not meet the assembly requirements, and the process returns to the step of obtaining the inclination of the sealing surface of the first pipe until the deviation is less than the preset error value. If the deviation is less than or equal to the preset error value, the pipe assembly meets the assembly requirements.

8. The method for assembling a pipe according to claim 1, characterized in that: Before obtaining the inclination of the sealing surface of the first connecting pipe, the method further includes: The sealing surface is pretreated.

9. The method for assembling a pipe according to claim 8, characterized in that: The pre-processing of the sealing surface comprises: The sealing surface is cleaned.

10. The pipe assembly method according to claim 8, characterized in that: The pre-processing of the sealing surface comprises: Performing laser scanning on the sealing surface, and judging whether the sealing surface has bumps and scratches according to the scanning result; If so, replace the first flange.

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